Pneumatic tire casing



' Sept. 6, 1938. GOTTLIEB PNEUMATIC TIRE GAS ING Filed July 22, 1936 O 000 QQQOOO 000 (I M oooo oooooooooo 0000 o ocr-eo woodooo 0 2a Z6 28 J2 2 30 BY INVENTOR, [all/'5' gaff/i619.

Patented Sept. 6, 1 938 2, 1

UNITED STATES ATENT OFFICE PNEUMATIC TIRE CASING Louis Gottlieb, Kansas City, Mo.

Application July 22, 1936, Serial No. 91,899

8 Claims. (01. 152-179) Thi i v n r l es o i p v ments in Fig.- 9 is also a showing of a modified form simipneumatic tire casings. lar to that shown in Fig. 8, and

By long service the thickened tread portion Fig. 10 is a detached, perspective view of one Of the Pneumatic i ca ing eco es W n away of the modified auxiliary tread members shown until the fabric becomes exposed. This weakin Fig. 9. 5 ens the tire and due to its thinness at the tread, Throughout the several Views like reference punctures are p b p r en d. By ddi characters designate like parts, and the numeral a new tread to these worn tires, it has been found l2 indicates a casing for pneumatic tires, having that the life of the tire is greatly increased; also, an annular casing M of the type commonly used.

0 blowout hazards are reduced. Heretofore protec- The outer periphery of casing I4 is provided with tive tread members have been secured to the a thickened tread portion I 6 which contacts the tread portion by vulcanizing or by means of se roadway and gradually wears away.

curing strips, links, etc., which interconnect with Referring to Fig. 3, which shows the tread porthe Wheel parts or with auxiliary rings which are tion [6 worn away, it will be observed that the provided as part of the equipment. outer edges of the tread portion are relatively 15 The principal object of the present invention thicker than the remainder thereof, thus presentis the provision of pneumatic tire casing having ing an annular rib l8 at each edge of the tread auxiliary tread members secured to the tread portion. These ribs serve as a body suitable for portion thereof by means of resilient connectors. anchoring the auxiliary tread members 20. Tread Another object of this invention is the provimembers 20 are preferably formed from old tire 20 sion of a pneumatic tire casing having auxiliary casings and consist of strips positioned transtread members secured directly to the tread of versely on the tread portion of the casing in the casing by means of elastic connectors which spaced-apart relation. The inside surface of the function to maintain the tread members in opauxiliary tread members is concave and conerative relation with the tread surface of the forms to the outer tread portion of the casing on 25 casing, regardless of the irregular distortion of which they are positioned, and may Vary in width the casing, when in operation. from relatively narrow strips to sections that A further object of the invention is the proviextend half way around the casing. sion of a casing having a series of spaced-apart These auxiliary tread members are independauxiliary tread members independently secured ently secured directly to the adjacent tread por- 30 to the adjacent tread portion of the casing. tion of the casing by means of connectors 22 and Other objects are simplicity and economy of 24. Preferably, connectors 22 and 24 are made construction, ease of operation, and adaptability of an elastic material such as rubber, and conto casings of the various makes. sist of a body portion 26 and enlarged end por- Reference will now be had to the drawing, tions 28. Connectors 22 are adapted to be 35 wherein: extended through edge portion of 2!] and the rib Fig. 1 is a side elevation of a casing for pneul8, as shown in Fig. 3. To position the connecmatic'tires embodying this invention. tors as shown, the shank and one end of the Fig. 2 is an edge elevation of the casing shown connector is inserted in the body portion of a 40 in g. 1. hollow sharpened needle so that as the needle is 40 Fig. 3 is an enlarged, cross-sectional View, passed through the rubber parts, the exposed, taken on line III-III of Fig. 1. enlarged end 28 will be engaged and as the needle Fig. 4 is an enlarged, fragmentary view of the is drawn from the parts, the connector will be edge of the casing. positioned as shown. When so placed, the rubber Fig. 5 is a detached view of the connector of the tread members will tightly engage the 45 used to secure the auxiliary tread member to body of the connector and the enlarged ends 28 the tread portion. will prevent the longitudinal movement thereof.

Fig. 6 is a detached view of the connector When so positioned these connectors are extendadapted to pass through the parts as shown in ed, and, thereby, due to their position at opposite Fig. 3. ends of the auxiliary tread member, will exert a 50 Fig. '7 is a modified form of the connector, tensioning of the tread member to maintain it having an undulated shank. in operative condition on the tread portion of Fig. 8 is a fragmentary view showing a modithe casing during the running operation. fled form of the auxiliary tread members, which This close fitting of the parts Will, to a large are adapted to interlock. degree, eliminate friction and heating of the 55 tread members. In many instances these side connectors will be sufficient to hold the auxiliary tread members in position; however, other c'onnectors 24 extended directly through the casing and tread members may be provided where greater securing strength is required.

In order to present a smooth surface at the inside of the casing, a large, flat head for the connector is required. It should be observed that the connectors function tojoin the tread members to the casing without passing through the casing, thus maintaining the inner surface of the casing in its natural form.

The modified form of connector shown in Fig. '7 having an undulated body portion 32 with an enlarged end 34 could be substituted for either of the connectors 22 or 24. The undulated body 32 would tend to grip the rubber of the treads to preclude longitudinal movement. More rigid connectors might be used, and in some instances screw connector members have been found to function satisfactorily.

The modified forms of auxiliary tread members shown in Figs. 8, 9 and provide for interlocking means between the members 40. A tongue 34 formed on one side of the members, and having an enlarged head 36 adapted to be snugly fitted into a notch 38 formed in the adjacent member, functions to interconnect the tread members. By this means it is apparent that all the tread members may be united together in an annular form about the casing. When so united, the edge connectors may be sufiicient to secure the parts together; however, connectors 24 may also be used with this form of auxiliary tread members if desired. Auxiliary tread members 20 may be made of a length sufficient to overlap the tread portion. of the casing to present a greater contact surface with the roadway.

It is apparent that many variations in size and shape of the parts may be made without departing from the scope of the appended claims.

What I claim is:

l. A casing for pneumatic tires comprising an annular one-piece casing having a tread portion at its outer periphery; spaced-apart, auxiliary tread members positioned on said tread portion; and elastic connectors extending diagonally through the outer portion of said tread portion and said tread members to independently secure each of said auxiliary tread members to said tread portion.

2. A casing for pneumatic tires comprising a onepiece annular casing having a substantially smooth tread portion at its outer periphery; spaced-apart, auxiliary tread members positioned on said tread portion; and elastic rivets to join and resiliently interconnect each of said auxiliary tread members with said tread portions.

3. A casing for pneumatic tires comprising a one-piece annular casing having a tread portion at its outer periphery; a series of spaced-apart auxiliary tread members positioned on said tread portion; means connecting the outer edges of each of said auxiliary tread members with the adjacent portion respectively of said tread portion; and elastic members extending through said tread portion and auxiliary tread member whereby they are joined together adjacent their center portions.

4. A casing-for pneumatic tires comprising an annular one-piece casing having a substantially smooth tread portion at its outer periphery; a series of interlocking, auxiliary tread members positioned on said tread portion; and elastic members to secure each of said auxiliary tread members to said tread portion to secure them against transverse and longitudinal relative movement.

5. A casing for pneumatic tires comprising an annular one-piece casing having a tread portion at its outer periphery; a series of interlocking, auxiliary tread members positioned on said tread portion; and elastic means extending through openings formed through said tread portion and said tread members to independently secure each of said auxiliary tread members to said tread portion and to exert a tension in said auxiliary tread members transversely to the tread portion. 6. A casing for pneumatic tires comprising an annular casing having an outer tread portion; sectional auxiliary tread members positioned on said tread portion; and elastic connectors interconnecting each of said auxiliary tread members with said tread portions; said connectors being under tension whereby a tension is set up in said tread members transversely tosaid tread portion.

'7. A casing for pneumatic tires comprising a unitary annular casing having a tread portion at its outer periphery; spaced apart auxiliary tread members positioned on said tread portion; and a plurality of spaced apart elastic connectors to secure each of said auxiliary tread members to said tread portion, whereby the auxiliary tread members are held in tension against said tread portion.

8. A casing for pneumatic tires comprising a one-piece annular casing having a tread portion at its outer periphery; spaced apart auxiliary tread members positioned on said tread portion; and elastic members respectively interconnecting the outer edges of each of said auxiliary tread members with said tread portion and exerting a tension on said auxiliary tread members transversely of said tread portion.

LOUIS GOTILIEB. 

